Twenty
years ago, one unit of first Internal Chain Stoker Coal Boiler
was imported from U.K. and installed at one of the leading five
star hotel in the City of Heilonjian, the ice cold city of Northern
China, where the quality of coal is different from that of other
part of China. Coal in the extreme Northern area is like the
coal of Russia. Sooner later, the leading boiler maker in that
City tried to manufacture the internal chain stoker boiler following
the design boiler from U.K. But, when they started to market
this new boiler to other provinces of China, they encountered
several problems due to the different characteristics of coal.
Coal of southern China is very much similar to the Indonesian
coal, that is classified as young bituminus coal. Major problem
were the low ash melting point of young coal and high content of fine particle
of 0-10 mm which almost shares 70% of the ROM coal from mining site. The Heilonjian
Boiler Factory had made model change as many as 7 times during 20years up to
now to solve the said problem in order to fit this Internal Chain Stoker Boiler
good for the coal of alal provinces of China (same as Indonesia). Firstly,
they modified from wet back design to dried back in order to give longer space
for the chain stoker extended to the back portion of the boiler shell so that
the chain stoker will have enough time for the finish burning process. Thus
unburn coal dropping at the end of the chain stoker was solved. Second modification
was made to the design of the chain stoker. Original U.K design could not accept
fine coal of 0-10 mm. After this modification, we can use fine coal of 0-10
mm without problem. After these improvement made on the original UK boiler,
as many as 450 units were successfully distributed to many provinces of China
up to this date. This year of 2003, Hamada Boiler of Japan enterred into a
exclusove distributorship agreement with the Heilonjian Boiler Factory to market
this Internal Chain Stoker Boiler under the Trademark of COALMAC to International
market using the existing Hamada network. Picture was taken in 1992 showing
the undergoing production of COALMAC boiler of 5 ton with the chairman of Hamada
Boiler standing in front.

Short Chain Stoker

European Chain stoker
was too short for the bituminus coal of China

Longer Chain Stoker

Later,improvement was made
to use full length of Chain Stoker to give more time
to burn local bituminus coal